If you want it to last more than a few meetings then s leisure battery is the only way to go. A car batt is designed for high amp discharge but never for long sustained deep discharge. 4-5 charges in a day at a meeting is a pretty considerable feet for a car batt. Leisure batts are designed with this long deep discharge in mind. Not only will you get 10 charges out of 1 batt the batt it's self will give you several seasons use!
However there is another option these days.
Good quality smooth sine wave. Generators are available for about £200 and provide an easy route to power. Especially if camping and doing multiday meets.
I personally would not be without mine now. Going back to heavy lead acid batts is a pain I'd rather not have to deal with!
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